When to plant onion in Santa Ana
Onion is cold-hardy, so every date keys off Santa Ana's frost dates.
Step 1 · Sow
Direct sow outdoors
Jan 1 – Jan 22
Sow straight into warm, workable soil.
Step 2 · Harvest
Harvest window
Apr 1 – Apr 21
Picking runs until conditions turn against the crop.
Window
Days to maturity
90 – 110 d
From sowing to first pick.
Common questions
When can I sow onion outdoors in Santa Ana?
Direct-sow around early January (Jan 1–Jan 22) in Santa Ana, based on its local frost dates. Confidence 82%.
When will onion be ready to harvest in Santa Ana?
Expect to harvest from around early April (Apr 1–Apr 21) in Santa Ana, based on its local frost dates. Confidence 76%.
How long is the growing season in Santa Ana?
Santa Ana has roughly 365 frost-free days, which is enough time to grow onion to maturity outdoors.
The rule of thumb
Sow onion as soon as the soil is workable — it tolerates cool weather and light frost. Every date on this page is derived from that rule and Santa Ana's frost dates.
Confidence 85/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.